The effect of (ZrB2-SiC) addition on microstructure and mechanical properties of NbMo-matrix composites fabricated by hot-pressing |
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| Affiliation: | 1. School of Physics, University of the Witwatersrand, South Africa;2. DST-NRF Centre of Excellence in Strong Materials, hosted by the University of the Witwatersrand, South Africa;3. Academic Development Unit (ADU), University of the Witwatersrand, South Africa;4. School of Mechanical, Industrial and Aeronautical Engineering, University of the Witwatersrand, South Africa;5. Pilot Tools (Pty) Ltd., Johannesburg, South Africa;6. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, South Africa;1. IMDEA Materials Institute, Calle Eric Kandel 2, 28906 Getafe, Madrid, Spain;2. Hyperion Materials & Technologies, Polígono Industrial Roca Calle Verneda S/N, Martorelles 08107, Barcelona, Spain;3. Łukasiewicz Research Network - Metal Forming Institute. Jana Pawla II 14, 61-139, Poznan, Poland;4. Universidad Carlos III Madrid, Av. Universidad 30, 28911, Leganés, Madrid, Spain. |
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| Abstract: | The effects of (0–60%) vol% (70 vol% ZrB2 + 30 vol% SiC) additions on microstructure and properties of NbMo substrate fabricated by hot-pressing were studied at room temperature. Types of formed phase were decided by the amount of ZrB2 and SiC additives. The effective eutectic phase was observed in 15 vol% (70 vol% ZrB2 + 30 vol% SiC)-NbMo, which was attributed to the addition of SiC. 30 vol% (70 vol% ZrB2 + 30 vol% SiC)-NbMo had the highest relative density of 98.69%. Compared with x ZrB2-NbMo composites, the addition of SiC could further improve the hardness of NbMoss in x (70% ZrB2 + 30% SiC)-NbMo when the value of x was same, and NbMoss in 60 vol% (70 vol% ZrB2 + 30 vol% SiC)-NbMo had the highest hardness of 6.82 GPa. Only the 15 vol% (70 vol% ZrB2 + 30 vol% SiC) addition could improve the compressive strength of NbMo matrix. The reasons for the low strength of 30, 45, 60 vol% (70% ZrB2 + 30% SiC)-NbMo were the lack of ductile phase and the large amount of hard phase production. |
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